On a freezing Thanksgiving morning in our little Michigan town, I stare at the empty seat by the window—where my son, Peter, always sat. Five years have crawled by since he left Kelly and the kids for another woman, and now he’s knocking on the door, desperate to come home. Torn between the love I’ll always have for my boy and the wrenching betrayal lingering in my chest, I wonder if forgiveness is something even a mother can find.